---
id: 656caf89ead43c0523378566
title: Task 85
challengeType: 19
dashedName: task-85
---

# --description--

In English, `a` and `an` are indefinite articles. `A` is used before words that begin with a consonant sound, and `an` is used before words that begin with a vowel sound.

# --question--

## --text--

Which sentence uses the indefinite articles correctly?

## --answers--

`A ergonomic chair and a mouse.`

### --feedback--

Consider the sound that starts the noun after the article. `A` is used before consonant sounds and `an` before vowel sounds.

---

`A ergonomic chair and an mouse.`

### --feedback--

Consider the sound that starts the noun after the article. `A` is used before consonant sounds and `an` before vowel sounds.

---

`An ergonomic chair and a mouse.`

---

`An ergonomic chair and an mouse.`

### --feedback--

Consider the sound that starts the noun after the article. `A` is used before consonant sounds and `an` before vowel sounds.

## --video-solution--

3

# --scene--

```json
{
  "setup": {
    "background": "company2-center.png",
    "characters": [
      {
        "character": "Tom",
        "position": { "x": 50, "y": 15, "z": 1.2 },
        "opacity": 0
      }
    ],
    "audio": {
      "filename": "1.1-2.mp3",
      "startTime": 1,
      "startTimestamp": 43.68,
      "finishTimestamp": 49.1
    }
  },
  "commands": [
    {
      "character": "Tom",
      "opacity": 1,
      "startTime": 0
    },
    {
      "character": "Tom",
      "startTime": 1,
      "finishTime": 6.15,
      "dialogue": {
        "text": "This is so cool. A standing desk, an ergonomic chair, and an ergonomic mouse.",
        "align": "center"
      }
    },
    {
      "character": "Tom",
      "opacity": 0,
      "startTime": 6.65
    }
  ]
}
```
